High impedance is likely to result in which of the following?

High impedance in pacing systems refers to the resistance against the flow of electrical current through the pacing leads and tissues. When the impedance is high, it hinders the current from flowing effectively. This results in low current flow, which is crucial for the pacing function to adequately stimulate the heart tissue.

When there is low current flow due to high impedance, it means that the pacemaker might not be able to deliver the necessary electrical stimulus effectively, potentially leading to inadequate pacing or capture of the heart.

The other choices do not accurately reflect the consequences of high impedance. High power output typically requires lower impedance to ensure adequate current delivery. Rapid battery drainage is more likely associated with lower impedance that may cause excessive current flow, leading to increased power consumption. Increased voltage, on the other hand, might be necessary to overcome high impedance for effective pacing, but it is not an automatic result of high impedance itself.

Understanding the impact of impedance on current flow is critical for effective pacing and ensuring that the heart receives the appropriate electrical signals.